Water-head for fluid-operated percussive tools.



L. c. BAYL'ES L A. H. TAYLOR.

WATER HEAD FOR FLUID OPERATED PERCUSSIVE TOOLS. APsucATloN FILED APR. s. |915.

1,201,576. v 'Patented 0t.17`,1916.

2 SHEETS-SHEET l.

/1 TTURNEY fUNiTED STATES PATENT oEEIoE.

LEWIS C. BAYLES AND ALBERT H. TAYLOR, OF EASTON, PENNSYLVANIA, ASSIGNORS TO INGERSOLL-RAND COMPANY, OF JERSEY C ITY, NEW JERSEY, A CORPORATION 0F NEW JERSEY.

WATER-HEAD For. FLUID-OPEEATED PEncUssIvE Toons.

Specication of Letters Patent.

Patented oct. v17, 1916.

Application led April 8, 1915.. Serial No. 18,889. I v

Auseful Improvement in Water-Heads for Fluid-Operated Percussive Tools, of which the following is a specification.

This invention relates to rock drills which are provided with means for passing water and, air through the drill steel and relates more particularly to a back head construe tion for tools of this type in which a water tube projects from the back head through ,the cylinder.

The object of this invention is to provide a simple and effective water head construction for such drills by means `.of which air can be taken from some portion ofthe interior of'thedrill where a supply under pregsure is available and mixed with a stream of water, the vcombined Istream passing through the fluid conveying tube to the hollow drill steel With this object in view, a Water head construction has been devised, a practical embodiment of which is represented in the accompanying drawings, in which, n A t Figure 1 shows'a side elevation of a telescopic air feed hammer drill, embodying the invention. Fig. 2 shows a plan of the water head proper, the drill being divided on the line II-II of Fig. 1, Figs. 3 and 4 are sections on the line A-B of different portions of the drill, and Fig. 5 shows a detail section through the mixing chamber air admission plug.v

The invention is shown in connection with a hammer drill comprising a drill cylinder 1, a head block 2 and an inner telescopic feed cylinder 3 secured to the head block2 and an outer telescopic feed cylinder 4. These parts 1, 2, 3 and 4 are of standard construction, and are adapted to be used together as a drilling engine without the interposition of the water head 5, which forms the subject of this invention. This water head 5 is a flat faced separate section, and as shown is inserted between the drill cylinder 1 and the forward side of the head block 2, the cylinder 1 and head block 2 being adapted to be secured together, however, without the interposition of this water head 5. In the I forward side of the Water head 5 is'secured a iuldconveying tube 6 which projects axi-l ally through the piston 7 ,sliding in the drill cyllnder 1, into the anvil block 8. The rear end of the water tube 6 is securedin the forward sideof the water head 5 by means of a packing nut 10 which is threaded into the front face of the water head 5,`packing 11 being placed in the interior of the nut 10. When the packing nut 10 is screwed down 1t lits over the ring 9 and the packing 11` is compressed, which causes it to press tightly against the tube 6 and thus secure said tube t3 1n the water-head 5. In the water head 5 1s a'mixing chamber 12 from which a passage leads to the back end of the tube 6. A limited supply of water is introduced into the mixmg chamber 12 through a hose 14 threaded into an' inlet aperture 15, an ordinary valve 16 being provided in the hose 14 to control the flow of water therethrough.

Into'the water head 5 is threaded an inlet plug 17 the forward end 18 of which isk from flowing back into' the air passage 19 when air is not passing through to prevent such flow of water. In the drill, as shown, the air passage 19 is connected with the ini terior 21 of the distributing valve chest of the drill, but may 'beconnected with any portion of the interior-of the drill, where there is a supply of air under pressure when the main air supply of the drill is turned on.- As shown, the air reaches the valve chest 21 from the inner telescopic air feed cylinder 3 by way of a controlling valve 22,.

air being admitted to the drill in the first instance to the outer telescopic feed cylinder 4' through a main supply controlling valve 23. a

In the operation of the drill, as shown, whenever air is admitted through the valve `chest 21 and consequently when the drill piston is in operation, air will pass through the passage 19 and force out the rubber sleeve 20, pass into the mixing chamber. 12 and from thence through the tube 6 to the hollow drill steel. At the same time, any amount of water 'can be passed through the hose 14 into the mixing chamber 12 and can be mixed with the a1r coming through the passage 19 andpass with it in a commingled stream of air and water to the hollow drill steel and from thence to the hole being drilled. When the air is shut oli'I from the valve chest 21 the flow of airV through passage 19 will cease, but the rubber sleeve 20 will prevent any Water from flowing back through the passage 19 into the interior of the drill. The passage of water from the hose 14 through the mixing chamber 12 and the tube 6 may continue, but such flow is immaterial, as this is the normal channel for the flow of such water, and it does not enter the interior of the drill and have a deleterious effect thereon.

Although the invention is here shown in connection with a telescopic air feed drill in which the air passing through the passage 19 comes from the distributingyvalve chest of the drill, it is obvious that the construction is adapted to any form of drilling engine in which it is desired to use water and air in the manner described, and that the passage'19 can be connected with any portion of the interior of the 'drill where there is an effective air pressure, constant or otherwise, during the operation of the drill, and it is to be understood that while the present showing and description ydiscloses only one specified modification of the present invention, other forms and modifications are included within the spirit and scope of the same, as expressed in the appended claims.

What we claim is:

1. In a fluid operated percussive drill having a cylinder, a piston therein, a water head, and a fluid conveying tube project- .ing from said water head through said piston, a mixing chamber in said water head, a conduit leading from said mixing chamber to said tube, a water conduit leading into said mixing chamber, an air conduit leading into saidmixing chamber, and a check valve mechanism for preventing the flow of' water into said air conduit from said mixing chamber.

y2. In a fluid operated percussive drill having a cylinder, a piston therein, a water head, and a fluid conveying tube projecting from said water head through said piston, a mixing chamber in said water head` a conduit leading from said mixing chamber to said tube, a water conduit leading into said mixing chamber, an air conduit leading into said mixing chamber, a check valve mechanism for preventing the flow of water into said air conduit from said mixing chamber, said check valve mechanism comprising a plug projecting into said mixing chamber having orifices in its sides leadmg from said air conduit, and a rubber sleeve litting over said plug. 3. ln a fluid operated percussive drill, having a cylinder, a piston therein, a water head and a fluid conveying tube projecting from said water head through said piston, a mixing chamber in said water head having a connection with said tube, a water conduit leading into said mixing chamber, an air conduit leading into said mixing chamber from an interior portion of said drill, and a check valve for preventing the flow of water from said mixing chamber through said air conduit into the interior of said drill.

4:. In a 'fluid operated percussive drill, having a cylinder, a piston therein, a water head and a fluid conveying tube projecting from said water head through said piston, a mixing chamber in said water head having a connection with said tube, a water conduit leading into said mixing chamber, an air conduit leading into said mixing chamber from an interior portion of said drill, a check valve for preventing the flow of water from-said mixing chamber through said air conduit into the interior of said drill, said check valve mechanism comprising a plug projecting into said mixing chamber having orifices in its sides leading from said air conduit and a rubber sleeve fitting over said plug.

5. In a fluid operated percussive drill having a cylinder, a piston therein, a valve chest, a water head and a fluid conveying tube projecting from said water head through said'piston, a mixing chamber in said water head connected with said tube, a valve controlled water conduit leading into said chamber, an air conduit leading from said valve chest to said mixing chamber, and a check valve to prevent flow of water from said mixing chamber into said valve chest.

6. In a fluid operated percussive drill having a cylinder, a piston therein,v a valve chest, a water head and a fluid conveying tube projecting from said water head through said piston, a mixing chamber in said Water head connected with said tube, a valve controlled water conduit leading into said chamber, an air conduit leading from said valve chest to said mixing chamber, a check valve to prevent flow of water from said mixing chamber into said valve chest, said check valve mechanism comprising a plug projecting into said mixing chamber having orifices in its sides leading from said air conduit and a rubber sleevefitting over said plug.

7 In a fluid operated percusive drill having a cylinder, a piston therein, a water head and a fluid conveying tube projecting from said water head, a water conduit leading into said tube, an air conduit leading into said tube, and a check valve to prevent back iow of Water into said air conduit.

8. In a Huid operated percussive drill having a cylinder, a piston therein, a Water head and a fluid conveying tube projecting from l said Water head, a Water conduit leading into said tube, an air conduit leading into said tube from the interior of said drill, and a check valve to prevent back iow of Water into the interior of said drill.

`9. As an article of manufacture, a Water head for rock drills comprising a separate section adapted to be secured at the rear end of a drill cylinder, a Huid conveying tube projecting from the front face of said head, a mixing chamber in said head, a conduit leading from said mixing chamber to said tube, a Water passage leading to said mix- In testimony whereof, We have hereunto 2 set our hands.

LEWIS C. BAYLES. ALBERT H. TAYLOR. 

